Dell Vostro 16 5630 Faulty Display

I bought a Dell Vostro 16 5630 laptop online on March 5, 2024. The following day, I got the device, but while setting it up, the screen started flickering. I suspected a driver issue, so I went ahead and updated them. However, to my dismay, the problem persisted. I reached out to the seller and asked for a direct exchange because the brand-new product was clearly defective.
I was notified that due to the product's on-site support, a Dell technician would have to visit and inspect it before starting the exchange process. On the morning of March 7th, at 8:15 AM, I reached out to Dell customer service to provide them with a detailed account of the situation. I was informed that the exchange process might take around 7-10 weeks. They also mentioned that if the seller had the laptop in stock, I could return it and get a new one.
Assuming the return would be expedited, I agreed and promptly sent them the necessary invoice. Unfortunately, despite their initial commitment of completing the task within 2-3 business days, there has been no progress made so far. They continue to insist that the request is still pending.
I'm really struggling to comprehend the level of inefficiency in this on-site support service. I kindly request a prompt resolution and a direct exchange for this product that appears to have a factory defect.